export{}

class Lady{
    content = 'hi, boy'
    sayHello() {
        return this.content
    }
}

class girl extends Lady {
    sayHello() {
        return super.sayHello() + '你好'
    }
    sayLove() {
        return 'I love you!'
    }
}

const goddess = new girl()
console.log(goddess.sayHello());
console.log(goddess.sayLove());